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Related Experiment Video

Updated: May 27, 2026

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

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Published on: May 10, 2012

Curved apparent motion induced by amodal completion.

Sung-Ho Kim1, Jacob Feldman, Manish Singh

  • 1Department of Psychology and Center for Cognitive Science, Rutgers University, New Brunswick, NJ, USA. sungho4@eden.rutgers.edu

Attention, Perception & Psychophysics
|November 10, 2011
PubMed
Summary
This summary is machine-generated.

Amodal completion can alter apparent motion (AM) perception. The visual system may deviate from shortest paths to explain object absence, favoring curved trajectories behind occluders at longer intervals.

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Area of Science:

  • Visual perception
  • Cognitive neuroscience

Background:

  • Apparent motion (AM) typically follows the shortest path principle.
  • Amodal completion involves perceiving objects as whole despite partial occlusion.

Purpose of the Study:

  • To investigate if amodal completion influences AM path perception.
  • To determine if AM can deviate from the shortest path due to amodal completion.

Main Methods:

  • Observers viewed alternating tokens moving behind a semicircular occluder.
  • Interstimulus intervals (ISIs) were varied (100-500 ms).
  • Factors like token shape and display orientation were manipulated.

Main Results:

  • Short ISIs led to reporting straight-path motion (outside occluder).
  • Long ISIs increased reports of curved-path motion (behind occluder).
  • Perception was influenced by token shape, orientation, gap, and depth cues.

Conclusions:

  • The visual system minimizes unexplained object absence, not just path length.
  • Amodal completion can override the shortest path principle in AM.
  • AM trajectory perception integrates object continuity and path efficiency.